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An Investigation of the Initiation, Maintenance and Stability of the Operation of Solar Ponds
Abdullah Ahmed Abdullah, Ahmed Farouk AbdelGawad, Kenneth Alan Lindsay
Title:"An Investigation of the Initiation, Maintenance and Stability of the Halocline underlying the Operation of Solar Ponds: Application to the Construction and Operation of an Experimental Solar Pond"
-The project that is supported by "King Abdulaziz City for Science and Technology, KACST", 12-MAT2969-10, Saudi Arabia.
Development of an Industry – Linked Mechatronics Program with Training of Trainers (DIMPTOT)
Member of the research team that is funded by the Tempus Scheme from the European Union, JEP – 33108 – 2005, Egypt.
Computer-Based Expert System for Gas Reforming and Turbomachinery Utilities
-Title:" Computer-Based Expert System for Gas Reforming and Turbomachinery Utilities - Operation and Preventive and Predictive Maintenance"
-Member of the research team that received funding from the United States Agency for International Development (USAID) under the University Linkages Grant II, Egypt.
Optimum Design of Hydrofoil Systems
July, 1999 -
Member of the research team that is funded by Office of Naval Research (ONR), Virginia Polytechnic Institute and State University (Virginia Tech), USA.
Nonlinear Active Control of Dynamic Systems
January, 1997 -
Member of the research team that is funded by Office of Naval Research (ONR), N00014-96-1-1123, Virginia Polytechnic Institute and Sate University (Virginia Tech), USA.
Hands-on engineering education by construction and testing of models of sailing boats
Published by (American Journal of Aerospace Engineering 01/2015; 2(1):11-30. DOI: 10.11648/j.ajae.s.20150201.12 )
Authors: Ahmed Farouk AbdelGawad. Published
This paper introduces involvement of the hands-on learning method. According to the modern environment of technology, engineering students have to realize the multidisciplinary nature of engineering systems. This learning technique is essential to offer students the necessary skills to master practical, organizational and work-group cleverness. The work is concerned with the redesign, construction and operation of two models of sailing boats. The approach of the work and final outputs are illustrated.
Computational investigation of aerodynamic characteristics and drag reduction of a bus model
Published by (American Journal of Aerospace Engineering 01/2015; 2(1):64-73. DOI: 10.11648/j.ajae.s.20150201.16 )
Authors: Eyad A. Mohamed, Muhammad N. Radhwi, Ahmed F. Abdel Gawad. Published
It is well-known that buses comprise an important part of mass transportation and that there are many types of buses. At present, the bus transportation is cheaper and easier to use than other means of transportation. However, buses have some disadvantages such as air pollution due to engine exhaust. This study is an attempt to reduce the gas emissions from buses by reducing the aerodynamic drag. Several ideas were applied to achieve this goal including slight modification of the outer shape of the bus. Thus, six different cases were investigated. A computational model was developed to conduct this study. It was found that reduction in aerodynamic drag up to 14% can be reached, which corresponds to 8.4 % reduction in fuel consumption. Also, Neuro-Fuzzy technique was used to predict the aerodynamic drag of the bus in different cases.
Performance evaluation of the tandem C4 blades for axial-flow compressors
Published by (American Journal of Aerospace Engineering 01/2015; 2(1):74-92. DOI: 10.11648/j.ajae.s.20150201.17 )
Authors: Atef M. Alm-Eldien, Ahmed F. Abdel Gawad, Gamal Hafaz, Mohamed G. Abd El Kreim. Published
The purpose of this work is to study the aerodynamic performance of a tandem C4 base-profile compressor blade using numerical tools. In this paper, the flow along the tandem blade is studied for various relative blade positions. In all the studied cases, the front blade is fixed and the position of the rear blade is varied as a function of the axial and tangential displacements. A computer code was developed in "Visual Basic" using linear strength vortex-panel method to predict the aerodynamic performance of the tandem blade.
Proposed simple electro-mechanical automotive speed control system
Published by (American Journal of Aerospace Engineering 01/2015; 2(1):1-10. DOI: 10.11648/j.ajae.s.20150201.11 )
Authors: Ahmed Farouk Abdel Gawad, Talal Saleh Mandourah. Published
Millions of people are killed or seriously injured on the roads due to terrified accidents every year. Most of these accidents are attributed to the over-speeding of the road vehicles. Thus, the road speed limiter (RSL) is a very important technique to reduce the possibility of road accidents. An interesting idea to control the speed of the vehicle is to apply electronic control of the air-supply that enters the vehicle carburetor according to road transmitters that are connected and operated either by local network or satellite. In the present paper, a control system was designed and implemented. It is consisted of a control mechanism and an electronic circuit to control the air-inlet to the carburetor according to pre-set programming based on the vehicle speed. Although, it is a challenging job to design and implement modifications to existing systems, the present speed control system was successfully implemented and tested. The present proposed mechanism is simple, inexpensive and suitable to be implemented in developing countries where a big number of cars still work using the traditional carburetor mechanism.
Computational Investigation of the Operation of Heat Conservation Wheels in AHU-Systems
Published by (Umm Al-Qura University Journal of Engineering and Islamic Architecture (UQU-UJEA) 05/2014; 5(2). )
Authors: Asim M. Wafiah, Ahmed Farouk Abdel Gawad, Muhammad N. Radhwi . Published May 01, 2014
In certain facilities with concern to air-conditioning systems, a heat transfer process is to be applied for heat recovery of the disposing return-air from the patient's room without contamination. Therefore, much attention has been paid recently to the conservation wheels.
Conservation wheel consists of a rotor with permeable storage mass fitted in a casing, which oper-ates intermittently between hot and cold fluids. The rotor is driven by a motor with relatively low speed so that the exhaust air and fresh air are alternately passed through each section. In this work, concen-tration is paid to the conservation wheel, which is the main component of the wheel air-conditioning system along with a parametric study to investigate the influence of the different parameters. A compu-tational model will be developed and validated by comparison to the results of others. The computa-tions are to be carried out using the commercial package ANSYS–Fluent, validation of the present com-putational model and technique was carried out successfully. Thus, present results can be taken with big confidence.
A Parametric Study of the Performance of Heat Recovery Wheels in HVAC System
Published by (Umm Al-Qura University Journal of Engineering and Islamic Architecture (UQU-UJEA) 05/2014; 5(2). )
Authors: Ghassan J. Softah, Muhammad N. Radhwi, Ahmed Farouk Abdel Gawad . Published May 01, 2014
The heat wheel is a key component in solid-energy systems that can be used in commercial building air-conditioning-systems in order to achieve energy savings. Rotary wheel-recovery consists of a rotor with permeable storage mass fitted in a casing that operates intermittently between hot and cold fluids. A unique advantage of rotary wheels is the capability of recover-ing sensible heat. At present, the analysis of the behavior of air handling units based on heat recovery wheels is a complex task to be done by a design engineer. In this work, a computa-tional study of heat recovery wheels is carried out for different operating conditions (inlet state, flow path, and wall material) to investigate the most effective parameters. The perfor-mance of the recovery wheel is evaluated by modeling a representative channel by a commer-cial software-package (ANSYS-Fluent). Thus, present results can be taken with big confidence.
New, Simple Blade-Pitch Control Mechanism for Small-Size, Horizontal-Axis Wind Turbines
Published by (Journal of Power and Energy Engineering 12/2013; 7(12):2237-2248. )
Authors: Ahmed F. Abdel Gawad. Published December 01, 2013
In the present research work, the pitch-control is carried out such that the rotor blades are rotated around their longitudinal axis while the rotor continues its normal rotation. It is really a challenge to produce a clever design to pitch the rotor blades by the optimal amount so as to maximize the power output at all wind speeds. The mechanism is implemented to a three-blade, horizontal-axis, home-scale wind turbine. The mechanism is powered by a suitable DC (direct-current) motor. The tests were carried out in the open section of a delivery wind tunnel. The air speed was measured by a suitable anemometer. The corresponding rotational speed (rpm) and output voltage at different wind speeds were measured and recorded for calibration of the control system. The mechanism proved to be successful in controlling the pitch angle over a wide range of wind speeds.
Utilization of Whale-Inspired Tubercles as a Control Technique to Improve Airfoil Performance
Published by (Transaction on Control and Mechanical Systems (TCMS) 05/2013; 2(5). )
Authors: Ahmed Farouk Abdel Gawad. Published May 01, 2013
This research exploits the Whale-inspired tubercles as a control technique to improve the performance of airfoils. The flow field of NACA0012 airfoil with spherical leading-edge tubercles was computationally simulated. This airfoil section resembles the flipper of the Humpback whale and is used in many engineering applications. Tubercles, with a diameter of 10% of the airfoil chord (C), are arranged such that the span-wise distance between the centerlines of two adjacent tubercles is 20% C. k- turbulence model was used for a wide range of angle of attack (α = 0o - 25o) and Reynolds number (Re = 65,000 - 1,000,000). Results demonstrated that the presence of tubercles improves the airfoil performance by delaying or even preventing stall in the investigated range of operating conditions (α and Re). Simple active control scheme is proposed to obtain optimum performance (i.e., optimum values of lift and drag coefficients).
A Modified Diffusion Coefficient Technique for the Convection Diffusion Equation
Published by (Applied Mathematics and Computation (Impact Factor: 1.35). 05/2013; 219(17):9317-9330. DOI: 10.1016/)
Authors: S. A. Mohamed, N. A. Mohamed, A. F. Abdel Gawad, M. S. Matbuly . Published May 01, 2013
A new modified diffusion coefficient (MDC) technique for solving convection diffusion equation is proposed. The Galerkin finite-element discretization process is applied on the modified equation rather than the original one. For a class of one-dimensional convection-diffusion equations, we derive the modified diffusion coefficient analytically as a function of the equation coefficients and mesh size, then, prove that the discrete solution of this method coincides with the exact solution of the original equation for every mesh size and/or equation coefficients. The application of the derived analytic formula of MDC is extended for other classes of convection-diffusion equations, where the analytic formula is computed locally within each element according to the mesh size and the values of associated coefficients in each direction. The numerical results for two-dimensional, variable coefficients, with boundary layers, convection-dominated problems provide stable and accurate solutions even on coarse grids.
Investigation of the Channel Flow with Internal Obstacles Using Large Eddy Simulation and Finite-Element Technique
Published by (Applied and computational mathematics. 01/2013; 2(1):1-13. DOI: 10.11648/j.acm.20130201.11 )
Authors: A. F. Abdel Gawad, N. A. Mohamed, S. A. Mohamed, M. S. Matbuly . Published
This paper considers the turbulent-flow characteristics and the mechanism of vortex shedding behind one and two square obstacles centered inside a 2-D channel. The investigation was carried out for a range of Reynolds number (Re) from 1 to 300 with a fixed blockage ratio β = 0.25. Comparison of the flow patterns for the single and two obstacles was feasible. The computations were based on the finite-element technique. Large-eddy simulation (LES) with the Smagorinsky method was used to model the turbulent flow. Streamline patterns and velocity contours were visualized to monitor the vortex shedding. The results show that the mechanism of the vortex shedding has different characteristics for the two cases of one and two square obstacles. Interesting findings and useful conclusions were recorded.
-Bronze Medal from Egyptian Syndicate of Engineers, 1994.
-Silver Medal from Egyptian Syndicate of Engineers, 1990.